<template>
	<view>
		<!-- 搜索栏 -->
		<my-search></my-search>
		
		<view class="scroll-view-container">
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<view @click="activeChanged(index)" :class="['left-scroll-view-item',active===index?'active':'']"
					v-for="(item , index) in cateList " :key='index'>{{item.cat_name}}</view>
			</scroll-view>

			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item ,index) in cateList2" :key='index'>
					<view class="cate-lv2-title">{{item.cat_name}}</view>
					<view class="cate-lv3-list">
						<navigator class="cate-lv3-item" v-for="(e,i) in item.children" :key='i'
							:url="`/subpkg/goods-list/goods-list?cid=${e.cat_id}`">
							<image :src="e.cat_icon"></image>
							<text>{{e.cat_name}}</text>
						</navigator>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	// 导入自己封装的 mixin 模块
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		  // 将 badgeMix 混入到当前的页面中进行使用
		  mixins: [badgeMix],
		data() {
			return {
				wh: 0,
				active: 0,
				// 分类数据列表
				cateList: [],
				cateList2: [],
				// 滚动条距离顶部的距离
				scrollTop: 0
			}
		},
		onLoad() {
			// 获取当前系统的信息
			const sysInfo = uni.getSystemInfoSync()
			// 为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			activeChanged(index) {
				this.active = index
				this.cateList2 = this.cateList[index].children
				// 让 scrollTop 的值在 0 与 1 之间切换
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 判断是否获取失败
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				this.cateList2 = res.message[0].children
				console.log(this.cateList)
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>
